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Cosmological perturbations in massive gravity and the Higuchi bound

2012/06/30 by Matteo Fasiello, Andrew J. Tolley · 11 citations
Physics and Astronomy · #Advanced Differential Geometry Research #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Physics #Theoretical physics #astro-ph.CO #gr-qc #hep-th

paper · pdf · doi:10.1088/1475-7516/2012/11/035

24 pages, typos and conventions corrected

arxiv created 2012/07/05 · openalex publication_date 2012/11/20 · arxiv updated 2015/06/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

In de Sitter spacetime there exists an absolute minimum for the mass of a spin-2 field set by the Higuchi bound m 2 ⩾ 2 H 2 . We generalize this bound to arbitrary spatially flat FRW geometries in the context of the recently proposed ghost-free models of Massive Gravity with an FRW reference metric, by performing a Hamiltonian analysis for cosmological perturbations. We find that the bound generically indicates that spatially flat FRW solutions in FRW massive gravity, which exhibit a Vainshtein mechanism in the background as required by consistency with observations, imply that the helicity zero mode is a ghost. In contradistinction to previous works, the tension between the Higuchi bound and the Vainshtein mechanism is equally strong regardless of the equation of state for matter.

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